Clean the new CRWContextMenuController

ios/web/public/web_state/context_menu_params.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 #ifndef IOS_WEB_PUBLIC_WEB_STATE_CONTEXT_MENU_PARAMS_H_
 #define IOS_WEB_PUBLIC_WEB_STATE_CONTEXT_MENU_PARAMS_H_
 
 #import <UIKit/UIKit.h>
 
 #import "base/mac/scoped_nsobject.h"
 #include "base/strings/string16.h"
 #include "ios/web/public/referrer.h"
 #include "url/gurl.h"
 
 namespace web {
 
 // Wraps information needed to show a context menu.
 struct ContextMenuParams {
  public:
   ContextMenuParams();
   ContextMenuParams(const ContextMenuParams& other);
   ~ContextMenuParams();
 
+  // Convenience constructor that creates a ContextMenuParams from a
+  // NSDictionary representing an HTML element.
+  // The fields "href", "src", "title", "referrerPolicy" and "innerText" will
+  // be used (if present) to generate the ContextMenuParams.
+  // All these fields must be NSString*.
+  // This constructor does not set fields relative to the touch event (view and
+  // location).
+  ContextMenuParams(NSDictionary* element);

[Eugene But (OOO till 7-30), 2017/01/17 18:12:48]

This method is specific to ios/web implementation details and I doubt that it
will be useful for any embedder. Can you move it to private part of the web
(f.e. as an utility function in context_menu_params_util)?

[Olivier, 2017/01/18 08:55:54]

I hesitated :)
Done.

+
   // The title of the menu.
   base::scoped_nsobject<NSString> menu_title;
 
   // The URL of the link that encloses the node the context menu was invoked on.
   GURL link_url;
 
   // The source URL of the element the context menu was invoked on. Example of
   // elements with source URLs are img, audio, and video.
   GURL src_url;
 
   // The referrer policy to use when opening the link.
   web::ReferrerPolicy referrer_policy;
 
   // The view in which to present the menu.
   base::scoped_nsobject<UIView> view;
 
   // The location in |view| to present the menu.
   CGPoint location;
 
   // The text associated with the link. It is either nil or nonempty (it can not
   // be empty).
   base::scoped_nsobject<NSString> link_text;
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_PUBLIC_WEB_STATE_CONTEXT_MENU_PARAMS_H_